A Cost Constrained Speech Recognition Systems

This paper describes the design, construction, and evaluation of a microprocessor-based, cost-constrained word recognition system. The system uses seven bandpass filters, logarithmically spaced, followed by envelope detectors. The final algorithm uses eight uniformly spaced time slices, and used dyn...

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Bibliographic Details
Main Author: Davidson,Walter F
Format: Report
Language:English
Subjects:
Active filters
Algorithms
Bandpass filters
Chebyshev distance measure
Classification
Coefficients
Computer Hardware
Demodulators
Distance measuring filters
Dynamic programming
Envelope detectors
Low costs
Mathematical filters
Microprocessors
Nearest neighbor
Numbers
Sensitivity
Signal processing
Speech recognition
Time warping
Voice Communications
Weighting functions
Word recognition
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Summary:This paper describes the design, construction, and evaluation of a microprocessor-based, cost-constrained word recognition system. The system uses seven bandpass filters, logarithmically spaced, followed by envelope detectors. The final algorithm uses eight uniformly spaced time slices, and used dynamic programming for time warping, with a weighted Tchebycheff distance. This system resulted in 98% correct recognition for the ten digits, 0 - 9, of the training group, and 96% correct recognition for the control group. The project demonstrated the necessity for an improvement gained with time warping. Rabiner's Unconstrained Endpoint Local Minima algorithm was used to perform the time warping. For the system used, it was found that a weighted Tchebycheff distance measure performed better than the Euclidean distance measure. The parameters were weighted inversely proportional to their variances. The results, however, were found to be relatively insensitive to the weighting coefficients. The additional hardware required for a typical microprocessor system, costs under $150. The ability to build the hardware for such a low cost was due to the use of Reticon's Universal Active Filter R5620, which costs under $7.00 each.